package com.ated.gulimall.product.service.impl;

import com.ated.common.utils.PageUtils;
import com.ated.common.utils.Query;
import com.ated.gulimall.product.dao.CategoryDao;
import com.ated.gulimall.product.entity.CategoryEntity;
import com.ated.gulimall.product.service.CategoryService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //组装成父子结构
        //2.1 找到所有的一级分类
        List<CategoryEntity> level1menus1 = entities.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map((menu)->{
                    menu.setChildren(getChildren(menu,entities));
                    return menu;
                })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                })
                .collect(Collectors.toList());
        return level1menus1;
    }

    @Override
    public void removemenuByIds(List<Long> asList) {
        //TODO  1.检查当前删除的菜单是否被引用
        baseMapper.deleteBatchIds(asList);
    }


    public List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter((CategoryEntity) -> {
            return CategoryEntity.getParentCid() == root.getCatId();
        })
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity, all));
                    return categoryEntity;
                }).sorted((menu1, menu2) -> {
                    return  (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());
        return children;
    }
}